All things related to multicast

["Kevin C. Almeroth" <>]

>>Date: Wed, 17 Apr 2002 09:00:17 -0500
>>From: Tim Ward 
>><>
>>To: Marshall Eubanks 
>><>
>>Cc: "Kevin C. Almeroth" 
>><>,
>>      
>> ,
>>  TECH 
>> <>
>>Subject: Re: Multicast Monitoring Widget
>>
>>Quoting Marshall Eubanks 
>>():
>>> Tim;
>>> 
>>> show ip mroute active
>>> 
>>> should show the multicast groups with their bit rate
>>
>>Yep, I use this one quite frequently.
>>
>>> MRTG should also show the groups
>>
>>Hmmmm.  Is it possible for MRTG to show the traffic on a group?
>>It really is a cisco mib question, I realize!
>>
>>> rtpdump will show the existance of packets.
>>
>>This may seem imminently doable.
>>
>>> Here is what we do
>>> 
>>> This command dumps two packets using rtpdump - this shows that the group 
>>> is "up"
>>> 
>>> rtpdump -F ascii 233.64.133.12/7004 | head -2
>>> 1018995500.480846 RTP len=120 from=63.105.122.8:32773 v=2 p=0 x=0 cc=0 
>>> m=0 pt=14 (MPA ,0,90000) seq=63834 ts=2426335622 ssrc=0x2712
>>> 1018995500.487719 RTP len=120 from=63.105.122.8:32773 v=2 p=0 x=0 cc=0 
>>> m=0 pt=14 (MPA ,0,90000) seq=63835 ts=2426337973 ssrc=0x2712
>>> Broken pipe
>>> [tme@hendrix
>>>  scripts]$
>>
>>Heck, I could probably do that!
>>
>>> It would be easy to write a cron job to rtpdump every N seconds, wait 1 
>>> second, and put up a flag if traffic was not found.
>>> 
>>> BTW, can we get this content here on the outside ?
>>
>>Alas, no.  We're trying to avoid running afoul of local channel 
>>redistribution
>>problems.  After all what would WGN say if they found out that people all
>>over the net were watching cubs baseball as sourced from NU?  Or more 
>>importantly, what would Village Inn Pizza (a local pizza place) think?
>>
>>However, we are working on using the same technology to multicast some of
>>our own content, which we would be able to make accessable to the outside.
>>
>>
>>